Hi, Last year, after I delivered a presentation on Scheme at a French-speaking virtual meeting of LilyPond users, I was asked if I could write that down in tutorial form, which I did as https://tutoriel-scheme.readthedocs.io. Over the past few days, I've set some time apart to translate that into English. The English version can be found here:
https://scheme-tutorial.readthedocs.io The translation is a bit unpolished at the moment, and I didn't proofread it yet; I indent to do that later. I hope this can help some people on their way to learning Scheme and LilyPond's inner workings. If you have feedback, feel free to drop me an email. Enjoy! Best, Jean